1987 Johnson Evinrude "CD" Colt/Junior thru 55 Commercial service repair manual, P/N 507546, Page 445Get this manual

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Screw in vacuum testerPump out to 3-5 inches (76 127 mm) of mercury and see if vacuum holdsThen pump out to 15 in (381 mm) of mercury and checkIf the gearcase fails to hold on either test, put lubrica

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